Manhole-lid.



No. 883,965. l PATBNTED APR. 71908. H. A. E. LIBBERT.

MAN HOLE LID.

APPLIGATION HLBDAUG. 2z, 190s.

2 SHEETS-SHEET z.

UNITED STATES PATENT OEEIOE.

HENRY ANTON EMIL LIEBERT, OF ROGIIDALE, ENGLAND, ASSIGNOR TO E. GREEN AND SON LIMITED, OF WAKEFIELD, ENGLAND, A CORPORATION OF GREAT BRITAIN.

MANHOLE-LID.

Application filed August 22, 1903.

T 0 all whom 'it may concern.'

Be it known that I, HENRY ANTON EMIL LIEBERT, subject of the King of Great Britain, residing at 180 Drake street, Rochdale, Lancashire, England, have invented certain new and useful Improvements in Manhole and Hand-Hole Lids for Fuel Economizers, Boilers, and th'e Like, of which the following is a specification.

The invention relates to the manhole and handhole lids Of economizer top boxes, boilers, and the like, and will be clearly understood from the following description aided by the accompanying drawings, in which Figure l is a sectional elevation of my improved construction of lid applied to the top of a fuel economizer box or boiler, the ordinary Lewis bolt fixing it in position. Fig. 2 is a plan with the Lewis bolt removed. Fig. 3 is a plan of the flexible portion of the lid. Fig. 4 part sectional elevation of same.

In ordinary construction the lids have taperedv edges, the smaller diameter being on the ou'tside of the box, in consequence these lids will not go through the hole they fit from the outside, but must be put in position from the inside of the box. For this reason a number of the lid holes are made Of such a shape that they will take the lids through from the outside, for instance, they are made Oval, the oval holes in the box being closed by the oval lids. TO attain this same object, I make a round compound lid in two parts, A B, the center part A being rigid and the outer part B flexible, in such a way that at the moment the flexible part B is being put through a smaller hole than its greatest outside diameter` it forms itself into an oval, but the moment it is through its hole O it springs back into its original round shape for accurately fitting its rigid ortion A from which it has momentarily been detached.

When the compound lid is in place it is securely held by the stud D being screwed to the bridge E by the nut F as is usual.

Specification of Letters Patent.

Patented April 7, 1908.

Serial No. 170,398.

get all the position from the inside, the last lid being pulled up in the ordinary way which is at present in vogue.

The flexible portion B is referably made of the same material as tie rigid portion (say cast iron) so as to allow of equal contraction and expansion, but such flexible portion may be made of material other than that of the rigid portion, such as cast iron rigid portion and cast steel flexible portion.

What I claim andr desire to secure by Letters Patent is :h

In a steam boiler or the like, the combination with a wall thereof having a circular aperture, the edge surface of which flares toward the interior of the boiler; of a compound closure for the said aperture, consisting of a circular disk of metal having its edge inclined in correspondence with the surface of the aperture, the greatest diameter of the disk being less than the shortest diameter Of the aperture, and a resilient ring of spring metal the inner and outer surfaces of which v 

